A032497 Numbers n such that 241*2^n+1 is prime.

36, 72, 288, 5528, 8904, 9876, 130992

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Ray Ballinger, Proth Search Page

Ray Ballinger & Wilfrid Keller, List of primes k.2^n + 1 for k < 300.

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Prog

(PARI) is(n)=ispseudoprime(241*2^n+1) \\ Charles R Greathouse IV, Jun 07 2017

Crossrefs

Cf. A032373, A032419, A032460.

Sequence in context: A347892 A066216 A355033 * A024973 A024975 A025399

Adjacent sequences: A032494 A032495 A032496 * A032498 A032499 A032500

Keyword

nonn,hard

Author

N. J. A. Sloane.

Extensions

One more term (from the Ballinger-Keller web page) from M. F. Hasler, Apr 18 2007

Status

approved